Socket for incandescent electric lamps.



J. J. RODNEY. SOCKET FOB. INGANDESGENT ELEGTRIG LAMPS.

1,037,994, Patented Sept. 10, 1912.

w 2 SHEET8- SHEET 1.

APPLICATION FILED JAN. 5, 1910.

- Inventor J. J. RODNEY. SOCKET FOB. INCANDESCENT ELECTRIC LAMPS.

APPLICATION FILED JAN. 5, 1910.

Patented Sept; 10, 1912.

JOHN T. RODNEY, F YORK, N. Y.

SOCKET FOR INCANDESCENT ELECTRIC LAMPS.

To all whom it may concern:

Be it known that I, JOHN J. RooNEY, a citizen of the United States, residing in the borough of Brooklyn of the city of New York, in the State of New York, have in vented certain new "and useful. Improve-- ments in Sockets for Incandescent Electric Lamps, of which the following is 2!,SPQCir, fication, reference being had to the accompanying drawings, forming a part hereof.

' This invention relates 'to socalled turndown incandescent electric lamps which have a "plurality of carbon filaments so re-' la-ted and combined with each other that one or-a-nother, at will, may be made to glow soas to secure lllummationof varying 1ntensrty. v

' The main purpose of the invention is to ."effect the changes in illumination, including the complete extinguishing of the light, through the operation of a chain-pull switch, in which successive pulls upon a pendant eifect acha-n'ge from one condition to another through the series. The-invention, however, is not necessarily limited to the useof the chain-pull, it being possible to operate the switch byv other means, such as a button, and the; invention therefore resides in various features of improved construction, whether the same be combined with a chain-put 'or not, as will more clearly appear hereinafter with reference to the accompanying drawings, in which Figure 1 is a view in side elevation of a lamp which embodies the present improveanents; Fig. 2 is -a detail view of the lamp base andswit-c'h socket, partly in section and partly in elevation, a portion of the lamp bulb and filaments 40 is a, view similar to Fig. 2 but on a plane of section at right angles to that of 2. Fig. 4 is a detail View in section on the plane indicated by the line 4-4 of Fig. 3, looking in the direct-ion of the arrows. 'Fig. 5 is a detail view in section on a. vertical plane indicated by th line 5-5 of Fig. 4;, looking, in the direct-ion o f the arrows. detail view in horizontal section on the plane indicated by the line -6-6 of Fig. 3, looking the direction of the arrows. Fig. 2 a detail View in section on'theplane indicated by the line 7-'7 of Fig. at, looking in the direction of the arrows. Fig. 8 isa detail view in section on the plane indicated 55' by the line 8--8 Specification of Letters Patent. Application filed January l5, 1910. Serial No.

.ondary filament 0.

being also shown. Fig. 3

of Fig. 4,1ooking in 1 9 direction of the arrows. F igs. 9 and 10 are detail views in front and side elevation of the rotatable contact plate. 1 t

In the embodimentof the invention shown in the drawings, the bulb a is mounted in a base a and has a main filament b and a sec- One terminal of the main filament b is connected by a leading in Patented Sept. 1 1912.

wlre b with an insulated contactb at the inner end of the lamp base a. One terminal of the secondary filament 0 is connected by .a leading in wire 0 to an insulated contact 0 also exposed'at the inner end of the base a. The other ends ofthe two filaments b and a have a common electrical connection,

the leading in wires 03 thereof being twisted together and connected to an insulated contact 2 exposed :at the inner end of the base a. The three contacts 6 0 and d may be mounted in' a common insulating block (1 carried by the base a, and they are preferably disposed symmetrically in said block. The base a is adapted to be received by the lower portion 6 of the switch-socket shell andhas pins (1 to enter bayonet slots 6 inathe edge of the shell, so that the bulb '.may 'be applied to and removed from the The shell of the switch socket is, preferably made in three switch-socket readily.

parts 6, e and eflfor convenience, the parts 6 and .6 being secured together by screws 6 while theshell member a which may be screw threaded for engagement with the terminal socket, not shown, is insulated-from the member 6 by an insulating sleeve 0 The'menrber 6 receives at its end an insulating block .69, which supports-acontact 6 Electrical connection between the :lamp and the line wire/s may be effected, as usual, I through the shell member a and the. contact 0' and corresponding .contacts in the supporting or terminal socket, not shown, to which the line wires are connected.

In thev shell member 6 is supported an insulating block or disk '7, in which are mounted contacts 9, h and 2', corresponding in number and arrangement, with the contacts 19 c and d, with which they cooperate. The contacts g, h and i are preferably yielding contacts so that proper cooperation with the contacts .5 c and 0Z is insured, each of such contacts g, h and z'being constructed, as is clearly shown, with respect to the contact h, in Fig. 3-, comprising an externally screw threaded tube It, having an enlarged com tact head if and held in the insulating block f by nuts 7L3. A contact finger 7L shouldered externally and held from disengagen'ient by the inward crimping of the tube h, is held yieldingly outward by a spring h".

The contact 9 is connected by an insulated wire g with the terminal contact a", the filament 6 being thus placcdin electrical connection with the line Wire.

The switch by which the connection of the contacts h and i with the other line" wire is controlled is a rotary switch and is mounted above the insulating block f within the shell member 0 In the form shown in the drawings it comprises thefollowing elements, towit: an insulating block is which is preferably formed on its face with a circular series secured thereto a 7c of fixed teeth, upon two of which are secured contact h, connected with spring contact hby insulatedwire h and post k and contact 71* connected with cont-act 2' by insulated wire i and post 11 a metallic frame comprising legs Z and Z, crossbar Z and stud Z the frame-being in electrical connection with the screw on the stud Z and having toothed driving member n, preferably of metal, for cooperation with the rotatable contact am, said driving member having connected thereto the chain-pull 0 by which it may be rocked in one direction and also having connected thereto one endof a spiral spring n which is mounted on the stud Z? and has its other end connected to the cross-bar V, by which spring the driving quadrant 'n is returned to normal position material, mounted when the pull on the chain is relaxed. Successive pulls on the chain, therefore, act through the pawl and ratchet device formed by the quadrant n and teeth of the rotatable cont-act m, to rotate the contact memberwith a step by step movement, causing its spring contact fingers m to pass successively over the contacts 2 and h and from contact therewith in succession upon the teeth 7: of the insulating block la,

tact member m. The latter is preferably provided with a plurality of contact fingers m so that such fingers may act in succes-,

v sion without requiring a multiplicity of op erations of the quadrant a between the end of each, series of circuit closing or circuit opening movements and the beginning of another series;

driving teeth m and an actu-- ating quadrant n, preferably of insulating which teeth form de-tents 'to' prevent backward rotation of the con- In describing the operation of the switch, it will be assumed that the movable contact m stands with its contact fingers m resting on the insulating block'lc. A pull upon the chain 0 then causes one of the fingers m to move into contact with the contact 2'". In, this position the circuit is completed from the terminal 6 through wire g, contact g, leading in wire 1), filament 1), leading in wire d, contact 11, cont-act i movable contact or circuit closer m and frame Z to the terminal shell e", thus short circuiting the secondary filament c and causing the main filament b to glow, giving the strongest illumination. Another pull on the chain 0 causes the contact finger m. of the circuit closer to move from the contact i to the contact k, the circuit through the contact 71 being therefore broken. The circuit is now completed from the terminal 6" through contact g, leading in wire I), filament 7), common connection 03, filament 0, leading in wire'c, contact h, contact h circuit closer 1m, and frame Z to the terminal shell 6 The relation between the two filaments is-such that when they are thus connected in series the secondary filament 0 alone glows, giving the lesser illumination. A third pull upon the chain 0 causes the contact finger m to move from the contact h", breaking the circuitthrough thefilaments and making the lamp dark. The next pull on the chain causes the other contact finger m to complete the cir cuit through the contact 7? and the main filament, short circuiting the secondary filament, as before.

It will be understood that the details of construction and arrangement of the switchsocket, switch and various contacts may be varied without departing from the spirit of the invention, which is not limited to the precise construction shown.

I claim as my invention:

1. In an incandescent electric lamp, the combinationof a lamp bulb, having two filaments in series, a lamp base having three 1nsulated contacts to which the free ends of the filaments and the common connection between the two are respectively connected, said contacts being independent of the base and insulated therefrom, a switch-socket to receive the lamp base, three contacts carried by the socket but independent thereof and insulated therefrom for cooperation with the contacts on the lamp base respectively and a controlling switch independent of all the said contacts and connections,' from said switch to the contacts carried by the socket.

-2. In an incandescent electric lamp, the combination of a lamp bulb, having two filaments in series, a lamp base having three insulated contacts to which the free ends of the filaments and the common connection between the two are respectively connected, said contacts being independent of the base 1 037994 7 I 3' and 'in siilated therefrom, a switch-socket to and connections from said switch t( the cop'- receive the lamp base, an insulating block tacts carried by the socket. carried by the switch-socket and three insu This specification signed and witnessed -lated contacts harried by said block and inthis 16th day of November, A. D. 1909.

5 dependent of and insulated fren 'th soeket JOHN J. ROONEY. vfor coiperation with the contacts onyt'he Signed in the presence of- "lamp base respectively, and a controlling ELLA J. KRUGER,

switch independent of all of said contacts; AMBROSE L. OSHEA. 

